added filter streams adapted from ChucK and revised wave form functions

 * LPF, HPF, BPF, BRF filters are 2nd order Butterworth filters.
   Derived verbatim from ChucK's implementation. This can probably
   be optimized by caching the tan/cos functions.
   Also, they do not yet handle frequency streams shorter than the
   stream to filter.
 * Basic wave forms are now Stream methods to allow concatenative style
   of FM synthesis (or LFOs). To generate e.g. a sine wave with constant
   frequency, you can still write Stream.SinOsc(440); or tostream(440):SinOsc()

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